因为屏幕变小了，这种移动数据传输趋向由专用软件驱动，一般而言，是为单一目标而开发的应用。
Because the screens are smaller, such mobile traffic tends to be driven by specialty software, mostly apps, designed for a single purpose.
传统的德育评价具有封闭性的特点，在评价主体、评价形式、评价目标等方面都趋向于单一和封闭。
Traditional way of moral education assessment is within a closed system with a closed and single assessment subject, assessment form and assessment target.
从前面或后面观察，前腿，也包括后腿飞节以下部位，运动时完全垂直于地面。当速度增加时，有单一轨迹的趋向。
Seen from front or rear, the forelegs, as well as the hind legs below the hock joint, move perpendicularly to the ground, with some tendency towards a single track as speed increases.
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